Pioneer PHR100-55 Instruction Manual page 58

Interrupted or shorted upper
F02
(supply) temperature sensor.
Interrupted or shorted lower
F03
(return) temperature sensor.
Upper (supply) temperature
F05
sensor exceeds 210
Lower (return) temperature
F06
sensor exceeds 210
No flame detected – Heater
will make three attempts at
ignition before the control
F09
goes into this lockout
condition. Will reset in 1
hour.
Loss of flame signal – The
heater will relight 4 times
F10 before the control goes into
this lockout condition. Will
reset in 1 hour.
False flame signal – The
heater will lock out if it
senses a flame signal when
F11F
there should be none
present.
Combustion fan speed
incorrect – The heater will
lock out if it senses that the
F13
fan speed is less than 70% of
expected rate for more than
60 seconds.
pp Parameters programmed
F31 Program parameter error
Table 16 - NOTE: If you replace a part to remedy a fault, it is recommended that you cycle the unit at least
three or four times to assure the fault has been resolved.
1. Check the electrical connection to the appropriate temperature sensor.
2. If connection is okay, replace bad sensor.
1. If water in tank is not greater than 210
o
F. 2. If wiring is okay, check appropriate sensor with ohmmeter and compare to reading in
resistance chart above. If reading does not agree with water temperature, replace bad
o
sensor.
F.
1. Watch the igniter through the observation window provided.
2. If there is no spark, check the spark electrode for the proper ¼" gap.
3. Remove any corrosion from the spark electrode and flame rectifier probe.
4. If there is a spark but no flame, check the gas supply to the heater.
5. If there is a flame, check the flame sensor.
6. Check any flue blockage or condensate blocks.
1. Monitor the gas pressure to the unit while in operation.
2. Assure that the flame is stable when lit.
3. Check to see if the green light on the display module is out while the heater is running.
4. If the green light doesn't come on or goes off during operation check the flame signal
on the status menu.
5. If the signal reads less than 1 microampere, clean the flame rectifier probe.
6. If the flame rectifier probe continues to read low, replace it.
1. Turn the gas off to the unit at the service valve.
2. If the flame signal is still present replace the igniter.
3. If the flame signal is not present after turning off the gas supply, check the gas valve
electrical connection.
4. If there is no power to the gas valve, remove the valve and check for obstruction in the
valve seat or replace the gas valve.
5. Turn the gas on at the service valve after corrective action is taken.
1. Check the combustion air fan wiring.
2. Replace the combustion air fan.
3. Replace the control board.
Press {S4} reset for at least 1 second.
Control must be re-programmed. If programming does not solve problem, control must
be replaced.
o
F, check wiring. Repair if faulty.
58